Whilst using keyboard and mouse, the chat bugs unlike how it previously was before the 1.19.1 update I believe. It made it to when typing with the keyboard the Xbox force opens the type screen even when using only keyboard and mouse where as this only occurred on controller previously, this makes it to where you can co longer press "TAB" on your keyboard to auto fill the command, but if you try your command will simply be erased. Not only this but also the copy and paste action that is available at the top of your screen via turning on the setting doesn't seem to work. The following picture may help understand. (as you can see the information typed into the Xbox type screen doesn't show in the Minecraft text box at the bottom.)